警察已经立案调查。
The police have opened a case.
to register (to an official organism); to file a case (for investigation)
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
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Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
警察已经立案调查。
The police have opened a case.
这个案件已经立案。
This case has been registered.